{ital In} {ital situ} high-pressure x-ray-diffraction study of TlReO{sub 4} to 14.5 GPa: Pressure-induced phase transformations and the equation of state
- Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science & Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822 (United States)
- Department of Geology and Geophysics, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822 (United States)
- Department of Geology, College of Natural Sciences, Gyeongsang National University, Jinju 660-701 (Korea, Republic of)
{ital In} {ital situ} high-pressure x-ray-diffraction studies have been carried out on TlReO{sub 4} up to 14.5 GPa at room temperature using a diamond-anvil cell. The x-ray data show that the orthorhombic {ital D}{sub 2{ital h}}{sup 16} TlReO{sub 4} (I) transforms to another closely related orthorhombic phase, TlReO{sub 4} (I{prime}) around 1.0 GPa, then to a wolframite-related monoclinic phase TlReO{sub 4} (II) near 2.0 GPa, and finally to a BaWO{sub 4} (II)-related monoclinic phase TlReO{sub 4} (III) at about 10 GPa. The volume change at the first transition is negligible, and about 2% and 9%, respectively, at the two subsequent transitions. The results suggest a very minor change in structure at the first transition. The 2% {Delta}{ital V} at the second transition is consistent with the proposed structural arrangement from pseudoscheelite phase (I{prime}) to the wolframite phase (II). The large {Delta}{ital V} at the third transition is attributed to a change to a truly octahedral coordination for Re with respect to oxygens. All the three high-pressure phases of TlReO{sub 4} are unquenchable and revert back to the low-pressure orthorhombic phase (I) on release of pressure. The results are in very good agreement with those obtained in a previous high-pressure Raman study up to 15 GPa. From pressure-volume data, we obtain a value of 26 GPa for the bulk modulus {ital K}{sub 0} of phases (I) and (I{prime}). The bulk moduli of phases (II) and (III) have been calculated as 45.6 and 47.6 GPa, respectively.
- OSTI ID:
- 44569
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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